IfcSweptDiskSolidPolygonal changed to IfcNonNegativeLengthMeausure

[SergejMuhic]

          @aothms @TLiebich It seems to me that the `IfcSweptDiskSolidPolygonal` was just changed to `IfcNonNegativeLengthMeausure` and the documentation has not changed. Must have been submitted to ISO like that then.

It's a unification

On this I would have expected the unification to go the other way around honestly. From a more common entity to the one that is less used.

Are there plans on changing the documentation? I was waiting with this PR for that but now I would have to merge for Tunnel Deployment to have a solid baseline.

EDIT: Just remembered that the where rule and 0 filet radius do not fit well together either.

Originally posted by @SergejMuhic in #467 (comment)

The WR does not make sense for FilletRadius=0. The documentation was not updated according to the agreement either.

Also, pinging @aothms all of the renamed attributes are desynched so they did not get documentation from the markdown.